GL_SGIS_sharpen_texture
https://www.khronos.org/registry/OpenGL/extensions/SGIS/SGIS_sharpen_texture.txt
GL_SGIS_sharpen_texture

	void glGetSharpenTexFuncSGIS (GLenum target, GLfloat* points)
	void glSharpenTexFuncSGIS (GLenum target, GLsizei n, const GLfloat* points)